fusion-plugin-i18n/dist-node-esm/loader.js

/** Copyright (c) 2018 Uber Technologies, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */
import { Locale, Locales } from 'locale';
import fs from 'fs';
import path from 'path';
import { memoize } from 'fusion-core';

const defaultResolveLocales = ctx => ctx.headers['accept-language'];

const loader = (resolveLocales = defaultResolveLocales) => {
  const readDir = root => {
    try {
      return fs.readdirSync(root);
    } catch (e) {
      return [];
    }
  };

  const root = './translations';
  const locales = readDir(root).filter(p => p.match(/json$/)).map(p => p.replace(/\.json$/, ''));
  const data = locales.reduce((memo, locale) => {
    const parsedLocale = new Locale(locale);
    memo[parsedLocale.normalized] = JSON.parse(fs.readFileSync(path.join(root, locale + '.json'), 'utf8'));
    return memo;
  }, {});
  const supportedLocales = new Locales(locales);
  return {
    from: memoize(ctx => {
      const expectedLocales = new Locales(resolveLocales(ctx));
      const locale = expectedLocales.best(supportedLocales);
      const translations = data[locale.normalized];
      return {
        translations,
        locale
      };
    })
  };
};

export default true ? loader : null;
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